Midwest:

* Abbott Northwestern Hospital, Minneapolis
* Barnes-Jewish Hospital/Washington University, St. Louis
* Cleveland Clinic
* Evanston Northwestern Healthcare, Evanston, Ill.
* Loyola University Medical Center, Maywood, Ill.
* Mayo Clinic, Rochester, Minn.
* Ohio State Unversity James Cancer Hospital, Columbus
* Rush University Medical Center, Chicago
* University Hospitals Case Medical Center, Cleveland
* University of Chicago Medical Center
* University of Michigan Hospitals and Health Centers, Ann Arbor
* University of Minnesota Medical Center, Minneapolis
* University of Wisconsin Hospital and Clinics, Madison
* William Beaumont Hospital, Royal Oak, Mich.